Mounting for electric lamps



D-. w. JOHNSON MOUNTING FOR ELECTRIC LAMPS Sept. 15, 1936.

Filed March 4,' 1932 mvzmoa DAVID w. JOHNSON BY HIS ATTORNEY.

Patented Sept. 15, 1936 UNITED STATES.

PATENT OFFICE MOUNTING FOR- ELECTRIC LAll/IPS necticut Application March 4, 1932, Serial No. 596,844

9 Claims.

This invention relates to electric lamp mountings or more particularly to mountings for small lamps of the type that are used behind a bullseye or jewel in aface or wall .plate to give a signal indicating the vcondition of the circuit. Such lamps are commonly used with electric attachment plug receptacles and switches to which a heating appliance such as an electric iron is to beconnected. Heretofore diificulty'has been encountered in .removing and replacing electric lamps in the above type of device, for the reason that only a smallamount of space is allowed for a persons fingers to manipulate the lamp during insertion or removal from the mounting.

It is an object of. my invention to provide means for mounting anelectric lamp in an insulating base, which means will be inexpensive to manufacture and will require less. time and space for the insertion and removal of the lamp from the base than heretofore. It is another object ,to provide a mounting for lamps used in the above type of device, which mounting can be removed by a single rectilinear movement from the base.

Other objects and advantages of my invention will appearas it is described in connection with the accompanying drawing.

. In the drawing:

Figure l is a plan view of my invention used in connection with an electric attachment plug receptacle.

Figure 2 is a side elevation view of the invention shown in Figure 1.

Figure 3 is a tr'ansversesectional view taken on line 33 of Figure 1.

Figure 4 is a transverse sectional view of the removable lamp mounting used in my invention, the section being taken on the line 4-4 of Figure 5.

ing.

For the sake of-illustration, my invention is shown in connection with an attachment plug receptacle. But it should be understood that this use of the invention is only one of many and that the invention is in nowise limited to use with an attachment plug receptacle.

Referring to the drawing, an insulating body In of porcelain or other suitable insulating material is supported by the usual ears H and has an attachment plug receptacle l2 at one end. At the opposite end of the body ll] there is a recess IE to accommodate an electric lamp Id. The recess l6 opens out into one side of the insulating body and is Wider at that side than at the other,

Figure 5 is a plan view of the removable mountsince the bulb of an electric lamp is commonly wider than its base. Near the inner end of the recess IS a transverse or lateral groove I1 is formed in the side walls, for the reception of a removable mounting on which the electric lamp is mounted.

The removable mounting for the lamp comprises a rectangular insulating plate [8 which is apertured to permit the passage therethrough of the base of the electric lamp M. A flanged metallic cup or socket member 20 whose diameter is equal to that of the aperture in the insulating plate i8 is seated in said aperture and an annular flange on the top of the cup lies against the face of the insulating plate l8. A thin metallic plate 22 is riveted to the plate I8 andholds the flange of the cup 2i] againstthe face of the insulating plate [8. This metallic plate 22 has an aperture of approximately the same size as the aperture in the insulating plate, and the metal at the edge of the aperture in the plate 22 is bent to provide a single thread of size and pitch to cooperate with the threads on the shell terminal 24 of the electric lamp l4. Near one end of the plate'22 a slit is made extending from one side of the plate almost to the other, thus providing a tongue 26 which may be bent up out of the plane of the plate. This is done so that when the lamp is screwed in the mounting and the'mounting is slipped into the groove I! in the body H], the finger 26 will resiliently engage with a fixed contact 30 located ,on top of the body It! adjacent the groove H. The contact 3!! is electrically connected by a screw ,32 with a receptacle contact (not shown) or it may be connected otherwise as conditions dictate. The cup 20 of the removable mounting has an aperture 2| in its bottom to permit the extension therethrough of the central contact 23 of the lamp base without engaging the cup 20.

At the rear of the recess l6 there is mounted a resilient v-bent stationary contact 21 which is held in position by a bus or connecting bar 28 that extends from a wire terminal 29 at one end of the base I!) through channels 3| in the upper surface of the base to the receptacle I 2. The resiliency of the center contact and the resiliency of the finger 26 provide sufiicient friction between the walls of the grooves l1 and the removable lamp mounting so that the mounting will not become accidentally dislodged, but on the other hand may be removed quickly and easily by rectilinear movement of the mounting perpendicularly to the base. As illustrated, the stationary contact with which the finger 26 engages is a slit washer, but it will be understood that any other suitable type of contact may be used in place of the washer.

Current entering the device may go from the wire terminal 29 connected with the bus bar 28, through the bus bar and center lamp terminal 23, through the lamp filament to the screw shell 24 of the lamp base, to the metallic plate 22 and through the finger 26 to fixed contact 30 which may be connected with another feed wire or with the attachment plug receptacle as dictated.

by the conditions of use.

When it is desired to remove the lamp to replace it or for some other purpose, it is simply necessary to grasp that portion of the insulating plate which extends above the surface of the base I 0 and pull the mounting and lamp as a unit away from the base. The lamp and its mounting may then be replaced as a unit, in the recess by sliding the plate l8 in the groove. In this way the awkwardness of unscrewing the lamp base from its mounting while the mounting is still situated in the base of the lamp recess is eliminated, because the lamp can be screwed into and unscrewed from its mounting while the mounting is removed from the base.

Many modifications within the scope of my invention will occur'to those skilled in the art, therefore I do not limit the invention to the specific embodiment shown.

I claim:-

1. A lamp mounting comprising an insulating base having a recess with a groove in the side thereof, plate means carrying a lamp and removably seated in said groove, said plate means having a portion engaging with said groove and frictionally holding said plate means in said groove, and means for electrically connecting the lamp terminals to a circuit.

2. A lamp socket adapted for sliding assembly in an insulating base, comprising an insulating plate, a socket member, and a metallic plate,

- means for holding the insulating plate, the socket member and the metallic plate in assembled relation, said metallic plate and socket member cooperating to receive and hold a lamp base.

3, A lamp socket adapted for sliding assembly in an insulating base, comprising an insulating plate, a socket member, and a metallic plate, means for holding the insulating plate, the socket member and the metallic plate in assembled relation, said metallic plate and socket member cooperating to receive and hold a lamp base, and said metallic plate having a resilient portion frictionally holding said socket in assembled position, in said insulating base.

4. A lamp socket adapted for sliding assembly in an insulating base, comprising a substantially rectangular apertured insulating plate, a flanged cup member having an aperture in its bottom, a metallic plate having a circular aperture the edge of the aperture being in the form of a thread and means for holding the insulating plate, the cup and the metallic plate in assembled relation with the apertures in alignment, said metallic plate and cup member cooperating to receive and hold a lamp base.

5. A lamp mounting comprising a recessed insulating base having a groove in the sides of the recess, contacts held to said base and having binding means associated therewith, means for electrically connecting said contacts to the base terminals of an electric lamp, said means including an insulating plate received within and removable from said groove, a socket member and a metallic contact plate held on said insulating plate and formed to receive and hold a lamp base, said metallic contact plate having a resilient portion electrically connected with one of said contacts.

6. A lamp mounting comprising a recessed insulating base having integral formations thereon in the sides of the recess for engaging a plate, contacts held to said base and having wire terminals electrically connected therewith, means for electrically connecting said contacts to the base terminals of an electric lamp, said means including an insulating plate engaged with said plate-engaging formations and removable therefrom independently of said contacts, and means on said plate to receive and hold an electric lamp base and to electrically connect the shell terminal of the lamp base with one of said contacts, when the plate is engaged with said plate engaging formations;

7. A lamp mounting comprising an insulating base, contacts held to said base, means for electrically connecting said contacts to the base terminals of an electric lamp, said means including a removable plate independent of said contacts, means on said plate to receive and hold a lamp base and to electrically connect the shell terminal of said lamp base to one of said contacts, said insulating base being provided with means to slidably receive said plate- 8. A lamp mounting comprising an insulating base having a recess with integral formations in the side thereof to engage a plate, a manually removable plate having means thereon for receiving the shell terminal of a lamp and for supporting the lamp, said plate being engaged with and held in position by said plate-receiving formations, and stationary contacts permanently secured to said insulating base and engaging the center lamp base contact and said plate respectively, when the plate is engaged with said plate DAVID W. JOHNSON. 65 

